Virtual Reality Interface with Omni-Directional Treadmill
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Solution Overview
Problem
Current virtual reality locomotion technologies are limited by high complexity, noise, and unnatural movement due to abrupt accelerations, lacking a convincing omni-directional system that provides safe, immersive, and cost-effective experiences for users.
Innovation Solution
A low-cost virtual reality interface system utilizing active breathing-controlled body weight support and a suspension system with a twisting belt and air balancer, combined with depth sensing cameras and intuitive gesture recognition, allowing for extreme physical movements, unrestricted omni-directional walking, and integration with existing fitness equipment for enhanced immersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If treadmill-like devices are used to simulate locomotion, then the user can walk or run in a virtual environment, but the user's movement is confined to one direction only
Solution Approach 1:
The treadmill surface is segmented into multiple independently controllable sections or zones. Each segment can move in different directions or at different speeds, allowing the user to step in any direction while each segment handles movement in its local direction. This segmentation enables omni-directional locomotion without requiring a completely complex new mechanism.
Solution Approach 2:
The system transitions from one-dimensional linear treadmill movement to two-dimensional planar movement by adding lateral motion capability. The treadmill surface can move not only forward/backward but also left/right, creating a 2D movement plane that enables omni-directional walking while maintaining a relatively simple flat-bed structure.
2Stability of the object's composition
If the treadmill immediately counteracts each step of the user, then the user position is stabilized, but large forces are generated due to abrupt accelerations
Solution Approach 1:
The treadmill incorporates cushioning elements or compliant mechanisms that absorb and dampen the impact forces before they are transmitted to the drive system. This cushioning layer allows the treadmill to respond to user steps without generating abrupt accelerations, reducing the peak forces while maintaining position stability through controlled response.
Solution Approach 2:
Instead of immediately counteracting each step, the treadmill uses periodic or delayed response mechanisms that smooth out the acceleration profile. The system responds to user movement in a rhythmically controlled manner, distributing the corrective forces over time rather than applying them abruptly, thereby reducing peak forces while maintaining stability.
3Adaptability or versatility
If 2D omni-directional actuation is achieved by combining translation with rotation, then the user can move in any direction, but the device complexity increases
Solution Approach 1:
The treadmill employs actuators that perform multiple functions simultaneously. Each actuator can provide both translational motion and rotational motion, or the same actuator mechanism serves different directional requirements at different times. This multi-functionality reduces the total number of actuators needed while achieving omni-directional capability.
Solution Approach 2:
The system merges translation and rotation actuation into a unified control system where a single actuator or mechanism can produce combined motion. By merging the actuation functions, the system achieves omni-directional movement with fewer independent components than would be required if translation and rotation were completely separate systems.
4Ease of operation
If a large platform is used to generate gentle accelerations, then the user experience is improved, but the cost and space requirements increase
Solution Approach 1:
The system uses counterbalancing mechanisms or force cancellation techniques that allow a smaller platform to achieve the same effective gentle acceleration experience. By using active control to counteract harsh movements, the system can maintain user comfort on a compact platform without requiring the large physical size of passive systems.
Solution Approach 2:
The system replaces purely mechanical large-platform solutions with active control systems using sensors and actuators. Instead of relying on the physical size of the platform to provide stability and comfort, the system uses electronic control to actively manage accelerations and forces, enabling compact dimensions while maintaining user comfort through intelligent force management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides high levels of safe physical immersion, enabling users to perform extreme movements with a powerful sense of participation in virtual worlds, offering rapid response, natural interaction, and compatibility with various devices, while being compact and affordable for home use.
Implementation Method 1
a suspension system with a twisting belt and air balancer
Implementation Method 2
depth sensing cameras and intuitive gesture recognition
Data Source
Figure 1A~1O
AI summary
A low cost, novel virtual reality (VR) interface, which conveys to users a powerful sense of physical participation in a virtual world. The proposed system includes high levels of safe physical immersion, even with the user making extreme physical motions such as running, jumping, tumbling and twisting. These manoeuvres are conducted with the user immersed in a low cost virtual reality environment that has almost immediate usability for first time users without the need for extensive training in how to use it safely.